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<li class="toctree-l2 current"><a class="current reference internal" href="">PhysX Visual Debugger (PVD)</a><ul>
<li class="toctree-l3"><a class="reference internal" href="#pvd">PVD</a></li>
<li class="toctree-l3"><a class="reference internal" href="#basic-setup-sdk-side">Basic Setup (SDK Side)</a><ul>
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  <div class="section" id="physx-visual-debugger-pvd">
<span id="physxvisualdebugger"></span><h1>PhysX Visual Debugger (PVD)<a class="headerlink" href="#physx-visual-debugger-pvd" title="Permalink to this headline">¶</a></h1>
<div class="section" id="pvd">
<h2>PVD<a class="headerlink" href="#pvd" title="Permalink to this headline">¶</a></h2>
<div class="figure align-center">
<img alt="../_images/PvdScreenshot.png" src="../_images/PvdScreenshot.png" />
</div>
<p>The PhysX Visual Debugger (PVD) provides a graphical view of the PhysX scene and includes various tools to inspect and visualize variables of every PhysX object. Additionally it can also record and visualize memory and timing data.</p>
<p>PVD can be downloaded from: <a class="reference external" href="https://developer.nvidia.com/physx-visual-debugger">https://developer.nvidia.com/physx-visual-debugger</a></p>
<p>Questions regarding the usage of the GUI should all be answered by its detailed built-in help.</p>
</div>
<div class="section" id="basic-setup-sdk-side">
<h2>Basic Setup (SDK Side)<a class="headerlink" href="#basic-setup-sdk-side" title="Permalink to this headline">¶</a></h2>
<p>PVD integration is enabled in the debug, checked and profiling configurations of the SDK. In order to reduce memory footprint and code size, it is not enabled in the release configuration.</p>
<p>The SDK outputs the PVD debugging data in form of a stream. PVD supports reading the stream either from a TCP/IP network socket or from a file.</p>
<div class="section" id="network-setup">
<h3>Network Setup<a class="headerlink" href="#network-setup" title="Permalink to this headline">¶</a></h3>
<p>Streaming to TCP/IP is supported on almost all platforms, and is usually the most convenient way to collect PVD data. In this mode the stream can be watched in real-time, depending on network speed and scene complexity. In network mode PVD acts as a TCP/IP server and must therefore be launched before the SDK tries to connect to it. The default listening port is 5425:</p>
<div class="highlight-c++"><div class="highlight"><pre><span class="n">use</span> <span class="k">namespace</span> <span class="n">physx</span><span class="p">;</span>

<span class="n">PxPvd</span><span class="o">*</span>  <span class="n">pvd</span> <span class="o">=</span> <span class="n">PxCreatePvd</span><span class="p">(</span><span class="o">*</span><span class="n">foundation</span><span class="p">);</span>
<span class="n">PxPvdTransport</span><span class="o">*</span> <span class="n">transport</span> <span class="o">=</span> <span class="n">PxDefaultPvdSocketTransportCreate</span><span class="p">(</span><span class="n">PVD_HOST</span><span class="p">,</span> <span class="mi">5425</span><span class="p">,</span> <span class="mi">10</span><span class="p">);</span>
<span class="n">pvd</span><span class="o">-&gt;</span><span class="n">connect</span><span class="p">(</span><span class="o">*</span><span class="n">transport</span><span class="p">,</span><span class="n">PxPvdInstrumentationFlag</span><span class="o">::</span><span class="n">eALL</span><span class="p">);</span>

<span class="n">PxPhysics</span><span class="o">*</span> <span class="n">physics</span> <span class="o">=</span> <span class="n">PxCreatePhysics</span><span class="p">(</span><span class="n">PX_PHYSICS_VERSION</span><span class="p">,</span> <span class="o">*</span><span class="n">gFoundation</span><span class="p">,</span> <span class="n">PxTolerancesScale</span><span class="p">(),</span> <span class="nb">true</span><span class="p">,</span> <span class="n">pvd</span><span class="p">);</span>

<span class="c1">//After releasing PxPhysics, release the PVD</span>
<span class="n">physics</span><span class="o">-&gt;</span><span class="n">release</span><span class="p">();</span>
<span class="n">pvd</span><span class="o">-&gt;</span><span class="n">release</span><span class="p">();</span>
<span class="n">transport</span><span class="o">-&gt;</span><span class="n">release</span><span class="p">();</span>
</pre></div>
</div>
</div>
<div class="section" id="file-setup">
<h3>File Setup<a class="headerlink" href="#file-setup" title="Permalink to this headline">¶</a></h3>
<p>Streaming to file is an alternative to network streams. This is the recommended fall-back in case your platform or system setup does not support a network connection to PVD. File streams are often faster than network sockets and therefore a good alternative if performance is more important than real-time viewing.
Streams stored as files can be loaded by drag&amp;drop or over the File-&gt;Load menu in PVD:</p>
<div class="highlight-c++"><div class="highlight"><pre><span class="n">use</span> <span class="k">namespace</span> <span class="n">physx</span><span class="p">;</span>

<span class="n">PxPvd</span><span class="o">*</span>  <span class="n">pvd</span> <span class="o">=</span> <span class="n">PxCreatePvd</span><span class="p">(</span><span class="o">*</span><span class="n">foundation</span><span class="p">);</span>
<span class="n">PxPvdTransport</span><span class="o">*</span> <span class="n">transport</span> <span class="o">=</span> <span class="n">PxDefaultPvdFileTransportCreate</span><span class="p">(</span><span class="n">filename</span><span class="p">);</span>
<span class="n">pvd</span><span class="o">-&gt;</span><span class="n">connect</span><span class="p">(</span><span class="o">*</span><span class="n">transport</span><span class="p">,</span><span class="n">PxPvdInstrumentationFlag</span><span class="o">::</span><span class="n">eALL</span><span class="p">);</span>

<span class="n">PxPhysics</span><span class="o">*</span> <span class="n">physics</span> <span class="o">=</span> <span class="n">PxCreatePhysics</span><span class="p">(</span><span class="n">PX_PHYSICS_VERSION</span><span class="p">,</span> <span class="o">*</span><span class="n">gFoundation</span><span class="p">,</span> <span class="n">PxTolerancesScale</span><span class="p">(),</span><span class="nb">true</span><span class="p">,</span> <span class="n">pvd</span><span class="p">);</span>

<span class="c1">//After releasing PxPhysics, release the PVD</span>
<span class="n">physics</span><span class="o">-&gt;</span><span class="n">release</span><span class="p">();</span>
<span class="n">pvd</span><span class="o">-&gt;</span><span class="n">release</span><span class="p">();</span>
<span class="n">transport</span><span class="o">-&gt;</span><span class="n">release</span><span class="p">();</span>
</pre></div>
</div>
</div>
</div>
<div class="section" id="advanced-setup">
<h2>Advanced Setup<a class="headerlink" href="#advanced-setup" title="Permalink to this headline">¶</a></h2>
<div class="section" id="connection-flags">
<h3>Connection Flags<a class="headerlink" href="#connection-flags" title="Permalink to this headline">¶</a></h3>
<p>To optimize the stream size we provide flags to enable specific features. This has both influence on PVD's and the SDK's performance:</p>
<ul class="simple">
<li><strong>PxPvdInstrumentationFlag::eDEBUG</strong>: Transfer all debug data to visualize and inspect objects. This flag has usually the biggest impact on the stream's size.</li>
<li><strong>PxPvdInstrumentationFlag::ePROFILE</strong>: Transfer timing information of various profiling zones in our SDK.</li>
<li><strong>PxPvdInstrumentationFlag::eMEMORY</strong>: Transfer memory usage data of our SDK.</li>
</ul>
<p>Setup to transfer only profiling data over network:</p>
<div class="highlight-c++"><div class="highlight"><pre><span class="n">pvd</span><span class="o">-&gt;</span><span class="n">connect</span><span class="p">(</span><span class="o">*</span><span class="n">transport</span><span class="p">,</span> <span class="n">PxPvdInstrumentationFlag</span><span class="o">::</span><span class="n">ePROFILE</span><span class="p">);</span>
</pre></div>
</div>
</div>
<div class="section" id="visualizing-externals-and-extended-data">
<h3>Visualizing Externals and Extended Data<a class="headerlink" href="#visualizing-externals-and-extended-data" title="Permalink to this headline">¶</a></h3>
<p>Joints are implemented as an extension to the SDK constraints and therefore need special handling to get transmitted to PVD.
Both joint and contact data can increase the stream size significantly. Visualizing it in PVD is therefore disabled by default. To enable them use following API calls:</p>
<div class="highlight-c++"><div class="highlight"><pre><span class="n">mScene</span><span class="o">-&gt;</span><span class="n">getScenePvdClient</span><span class="p">()</span><span class="o">-&gt;</span><span class="n">setScenePvdFlags</span><span class="p">(</span><span class="n">PxPvdSceneFlag</span><span class="o">::</span><span class="n">eTRANSMIT_CONSTRAINTS</span> <span class="o">|</span> <span class="n">PxPvdSceneFlag</span><span class="o">::</span><span class="n">eTRANSMIT_SCENEQUERIES</span> <span class="o">|</span> <span class="n">PxPvdSceneFlag</span><span class="o">::</span><span class="n">eTRANSMIT_CONTACTS</span><span class="p">);</span>
</pre></div>
</div>
<p>or set the flags separately:</p>
<div class="highlight-c++"><div class="highlight"><pre><span class="n">mScene</span><span class="o">-&gt;</span><span class="n">getScenePvdClient</span><span class="p">()</span><span class="o">-&gt;</span><span class="n">setScenePvdFlag</span><span class="p">(</span><span class="n">PxPvdSceneFlag</span><span class="o">::</span><span class="n">eTRANSMIT_CONSTRAINTS</span><span class="p">,</span> <span class="nb">true</span><span class="p">);</span>
</pre></div>
</div>
</div>
<div class="section" id="visualizing-scenequery">
<h3>Visualizing SceneQuery<a class="headerlink" href="#visualizing-scenequery" title="Permalink to this headline">¶</a></h3>
<p>Visualizing SceneQuery in PVD is disabled by default since queries and hits data can increase the stream size significantly. To enable it use following API calls:</p>
<div class="highlight-c++"><div class="highlight"><pre><span class="n">mScene</span><span class="o">-&gt;</span><span class="n">getScenePvdClient</span><span class="p">()</span><span class="o">-&gt;</span><span class="n">setScenePvdFlag</span><span class="p">(</span><span class="n">PxPvdSceneFlag</span><span class="o">::</span><span class="n">eTRANSMIT_SCENEQUERIES</span><span class="p">,</span> <span class="nb">true</span><span class="p">);</span>
</pre></div>
</div>
</div>
<div class="section" id="custom-pvdclient">
<h3>Custom PvdClient<a class="headerlink" href="#custom-pvdclient" title="Permalink to this headline">¶</a></h3>
<p>Implement the PvdClient interface if your application needs to react upon connection or disconnection from PVD, or if you plan to send custom PVD events from your application.
It is recommended to toggle the contact and constraint visualization in the onPvdConnected/onPvdDisconnected callbacks to avoid potential memory and compute overhead in the SDK:</p>
<div class="highlight-c++"><div class="highlight"><pre><span class="c1">// derive from PvdClient</span>
<span class="k">struct</span> <span class="n">MyPvdClient</span> <span class="o">:</span> <span class="k">public</span> <span class="n">physx</span><span class="o">::</span><span class="n">pvdsdk</span><span class="o">::</span><span class="n">PvdClient</span>
<span class="p">{</span>
    <span class="k">virtual</span> <span class="kt">void</span> <span class="n">onPvdConnected</span><span class="p">()</span>
    <span class="p">{</span>
        <span class="c1">// 1. create a PvdDataStream</span>
        <span class="c1">// 2. send your custom PVD class descriptions from here</span>
        <span class="c1">// this then allows PVD to correctly identify and represent</span>
        <span class="c1">// custom data that is sent from your application to a PxVisualDebuggerConnection.</span>
        <span class="c1">// example in JointConnectionHandler</span>
        <span class="c1">// 3. do something when successfully connected</span>
        <span class="c1">// e.g. enable contact and constraint visualization</span>
    <span class="p">}</span>
    <span class="k">virtual</span> <span class="kt">void</span> <span class="n">onPvdDisconnected</span><span class="p">()</span>
    <span class="p">{</span>
        <span class="c1">// handle disconnection, release PvdDataStream</span>
        <span class="c1">// e.g. disable contact and constraint visualization</span>
    <span class="p">}</span>
    <span class="c1">//impleament other methods</span>
    <span class="p">...</span>
<span class="p">};</span>

<span class="c1">// register custom handler</span>
<span class="n">MyPvdClient</span> <span class="n">myPvdClient</span><span class="p">;</span>
<span class="n">pvd</span><span class="o">-&gt;</span><span class="n">addClient</span><span class="p">(</span><span class="n">myPvdClient</span><span class="p">);</span>
</pre></div>
</div>
</div>
<div class="section" id="pvd-error-stream">
<h3>PVD Error Stream<a class="headerlink" href="#pvd-error-stream" title="Permalink to this headline">¶</a></h3>
<p>PhysX SDK sends all its own error messages to PVD if PVD is connected.
In addition, you can call Ps::Foundation::error() or Ps::Foundation::getErrorHandler()::reportError() to report your error message. These functions will send error messages to PVD automatically.</p>
<p>The messages will be listed in ErrorStream view of PVD.</p>
</div>
<div class="section" id="custom-profiling">
<h3>Custom profiling<a class="headerlink" href="#custom-profiling" title="Permalink to this headline">¶</a></h3>
<p>When using PxPvdInstrumentationFlag::ePROFILE, PVD internally calls PxSetProfilerCallback() to set itself up as the current profiler. This happens during the PxPvd::connect() call, and it overrides the potentially already existing profiler callback. That is, if users call PxSetProfilerCallback() with their own user profiler callback, and then initialize PVD with PxPvdInstrumentationFlag::ePROFILE, then the user profiler callback is lost. Similarly, initializing PVD first then calling PxSetProfilerCallback() will make PVD's profiling results vanish.</p>
<p>In case both PVD's internal profiling and a user's custom profiling are needed at the same time, it is recommended to initialize PVD first, then call PxSetProfilerCallback() with your own profiler. In your implementation, call the PVD profiling functions manually, before or after performing your own profiling operations:</p>
<div class="highlight-c++"><div class="highlight"><pre><span class="k">struct</span> <span class="n">UserProfilerCallback</span> <span class="o">:</span> <span class="k">public</span> <span class="n">PxProfilerCallback</span>
<span class="p">{</span>
        <span class="n">PxPvd</span><span class="o">*</span> <span class="n">mPvd</span><span class="p">;</span>

        <span class="k">virtual</span> <span class="kt">void</span><span class="o">*</span> <span class="nf">zoneStart</span><span class="p">(</span><span class="k">const</span> <span class="kt">char</span><span class="o">*</span> <span class="n">eventName</span><span class="p">,</span> <span class="kt">bool</span> <span class="n">detached</span><span class="p">,</span> <span class="kt">uint64_t</span> <span class="n">contextId</span><span class="p">)</span>
        <span class="p">{</span>
                <span class="c1">// Do custom profiling here</span>

                <span class="c1">// Then re-route to PVD implementation</span>
                <span class="k">return</span> <span class="n">mPvd</span><span class="o">-&gt;</span><span class="n">zoneStart</span><span class="p">(</span><span class="n">eventName</span><span class="p">,</span> <span class="n">detached</span><span class="p">,</span> <span class="n">contextId</span><span class="p">);</span>
        <span class="p">}</span>
        <span class="k">virtual</span> <span class="kt">void</span> <span class="nf">zoneEnd</span><span class="p">(</span><span class="kt">void</span><span class="o">*</span> <span class="n">profilerData</span><span class="p">,</span> <span class="k">const</span> <span class="kt">char</span><span class="o">*</span> <span class="n">eventName</span><span class="p">,</span> <span class="kt">bool</span> <span class="n">detached</span><span class="p">,</span> <span class="kt">uint64_t</span> <span class="n">contextId</span><span class="p">)</span>
        <span class="p">{</span>
                <span class="c1">// Do custom profiling here</span>

                <span class="c1">// Then re-route to PVD implementation</span>
                <span class="n">mPvd</span><span class="o">-&gt;</span><span class="n">zoneEnd</span><span class="p">(</span><span class="n">profilerData</span><span class="p">,</span> <span class="n">eventName</span><span class="p">,</span> <span class="n">detached</span><span class="p">,</span> <span class="n">contextId</span><span class="p">);</span>
        <span class="p">}</span>
<span class="p">};</span>
</pre></div>
</div>
<p>This is illustrated in SnippetCustomProfiler.</p>
</div>
</div>
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